JP4039365B2 - Combustion device - Google Patents

Description

  The present invention relates to a combustion apparatus that vaporizes and burns oil mainly used in an oil fan heater.

Conventionally, in this type of combustion apparatus, both the insulator portion of the spark plug and the insulator portion of the frame rod are simultaneously held and fixed to the burner case by one fixing bracket. The fixing metal fitting is attached to the burner case by screwing one fastening screw inserted through an intermediate position between the two lever portions (see, for example, Patent Document 1).
On the other hand, in order to reduce the number of assembling steps, there is also one in which a spark plug and a flame detection rod are integrally formed on a support formed of a lever (see, for example, Patent Document 2).

JP-A-6-42716 (page 3, FIG. 1) Japanese Utility Model Publication No. 3-14569 (page 5-7, FIG. 2)

In this type of combustion device, the spark plug discharges from and burns to the burner head, and the flame detection rod detects the flame current by applying a voltage to the burner head during combustion. In order to suppress variation in performance, it is necessary to make the distance between the spark plug, the tip of the flame detection rod, and the flame hole of the burner head constant.
However, in the conventional combustion apparatus, normally, glaze is uniformly applied to the entire outer surface of the insulator. Therefore, in the configuration of Patent Document 1, the frictional force of the contact surface with the burner case and the fixture is low. The problem is that the fixed position of the spark plug or flame detector rod moves due to vibration during assembly, use or transportation, and the distance between the tip of the spark plug or flame detector rod and the flame hole of the burner head occurs. was there.

Further, in the combustion apparatus of Patent Document 1, when assembling, first, the ignition plug and the flame are inserted so that the lower cylindrical part of the insulator of the spark plug and the lower cylindrical part of the insulator of the flame detection rod are inserted into the mounting holes of the burner case. Set the detection rod in the burner case, and then insert the upper cylindrical portion of the spark plug insulator and the upper cylindrical portion of the flame detection rod insulator into the insertion hole provided in the fixture, and form the spark plug insulator Set the fixing bracket to the burner case at a position where both the mounting flange portion and the mounting flange portion formed on the flame detection rod lever are simultaneously sandwiched between the burner case and the fixing bracket. The fastening screw inserted in the middle of the upper cylindrical part of both the spark plug and the flame detection rod inserted into the burner case is screwed to the burner case, which requires a lot of man-hours and is difficult to assemble. .

Further, in the combustion apparatus of Patent Document 2, not only the cost of the support made of the insulator is increased, but also the spark plug and the flame detection rod integrated with the insulator have a large variation in the size of the insulator due to the material of the insulator. The margin between the insulator cylinder and the mounting hole of the burner case had to be secured. For this reason, the position of the insulator is difficult to determine at the time of installation, and the variation in the distance between the spark plug, the flame detection rod and the flame hole is large. For this reason, if the inspection process at the time of assembly is out of tolerance, readjustment is necessary, and there is a problem that readjustment must be performed by changing the bending angle of the tip of the spark plug and flame detection rod. It was.

The present invention has been made to solve the above-described problems, and prevents a deviation in the distance between the tip of the ignition plug and the flame detection rod and the flame hole of the burner head due to vibration during assembly, use, or transportation. An object of the present invention is to provide a combustion apparatus that can be manufactured at low cost and can reduce the number of assembly steps.
It is another object of the present invention to reduce the variation in the distance between the tip of the spark plug and flame detection rod after assembly and the flame hole of the burner head and eliminate the need for readjustment.

A combustion apparatus according to the present invention includes a vaporizer for vaporizing fuel, a burner head for burning vaporized gas, a spark plug and a flame detection rod provided at a predetermined distance from a flame hole of the burner head, and the vaporizer And a fixing bracket for attaching the insulator part of the ignition plug and the flame detection rod to the burner case, and the ignition plug, the flame detection rod and the fixing bracket are integrated in advance and attached to the burner case. In the combustion apparatus, the ignition plug and the flame detection rod and the fixture are inserted into a burring insertion hole formed in the fixture, respectively, and the insulator portion of the ignition plug and the flame detection rod are respectively bonded, press-fitted, or caulked. And a burring mounting hole is formed in the burner case, and this burring mounting Wherein a burring insertion hole of the fixing bracket which was so as to loosely fit in.

According to the combustion apparatus of the present invention, since the insulator part provided integrally with the spark plug and the flame detection rod is integrated with the fixing bracket in advance, it is attached to the burner case, so that the insulator coated with the conventional glaze is applied. The coefficient of friction between the bracket and the burner case is greater than the coefficient of friction between the part and the burner case, and even if an external force is applied during assembly, use, or transportation, the fixed position will not move. It is possible to reliably prevent the distance between the tip of the spark plug and the flame detection rod and the flame hole of the burner head. In addition, since the spark plug and the flame detection rod are integrated with the fixing bracket in advance, it is only necessary to attach the fixing bracket to the burner case at the time of assembly. The effect of being simple is obtained.

Embodiment 1.
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view of a combustion apparatus showing Embodiment 1 of the present invention, FIG. 2 is a longitudinal sectional view thereof, FIG. 3 is a perspective view thereof, and FIG. 4 is a sectional view thereof.
1 to 4, a sheathed heater 1a is embedded in a vaporizer 1 that vaporizes fuel. The mixing plate 2 uniformly mixes the vaporized fuel gas with the combustion air. The burner head 3 formed in the shape of a dome is provided with a plurality of flame holes 3a in the peripheral wall portion, and a wire net 3b is attached to the outside of the flame holes 3a. A combustion ring 4 provided on the outer periphery of the burner head 3 recovers heat from the flame burning in the burner head 3 and guides the flame upward. The burner case 5 accommodates the carburetor 1 and has a flange portion 5g in which mounting holes 5a and 5b for mounting a spark plug and a flame detection rod, which will be described later, and a screw hole 5c for a tightening screw, which will be described later, are formed. .

  The spark plug 6 integrally has a cylindrical insulator 8 and ignites the vaporized gas ejected from the flame hole 3a. The flame detection rod 7 integrally has a cylindrical insulator 9 for detecting the flame formed in the flame hole 3a and the flame current. The fixture 10 is made of metal and has burring insertion holes 10a and 10b in which burrings 10d and 10e are formed by pressing and an insertion hole 10c of a tightening screw to be described later. Cylindrical insulators 8 and 9 provided integrally with the spark plug 6 and the flame detection rod 7 are inserted into the burring insertion holes 10a and 10b, and a joint portion between the two is bonded by an adhesive 12 such as an aron ceramic. ing.

  The tightening screw 11 fixes the fixing bracket 10 to the flange portion 5 g of the burner case 5. The fuel nozzle 12 supplies liquid fuel into the vaporizer 1. The fuel nozzle 12 communicates with a fuel tank via a fuel supply pipe and an electromagnetic pump (not shown). Moreover, although not shown in figure, the primary air channel | path which supplies combustion primary air in the said vaporization part 1, and the air blower connected to this channel | path are provided. These constitute the combustion apparatus of the first embodiment.

In the configuration of the first embodiment, the spark plug 6 and the flame detection rod 7 have the insulators 8 and 9 provided integrally therewith inserted into the burring insertion holes 10a and 10b of the fixing bracket 10 and bonded to the joints. The material 12 is applied and bonded in advance to be integrated. The fixing metal fitting 10 in which the spark plug 6 and the flame detection rod 7 are integrated has the burring insertion holes 10a and 10b loosely fitted in the mounting holes 5a and 5b of the burner case 5, and the fastening screw 11 is fixed to the fixing metal 10. Is inserted into the insertion hole 10c, and the tip thereof is screwed into the screw hole 5c to be attached to the burner case 5. For this reason, the spark plug 6 and the flame detection rod 7 are held in contact with the burner case 5 and the fixture 10.

Therefore, the coefficient of friction between the fixing bracket 10 and the burner case 5 shown in the first embodiment is larger than the coefficient of friction between the insulators 8 and 9 coated with the conventional glaze and the burner case 5 and the fixing bracket 10. Therefore, even if an external force is applied during assembly, use, or transportation, the fixed position does not move, and the distance between the tip of the spark plug 6 and the flame detection rod 7 and the flame hole 3a of the burner head 3 is shifted. Can be prevented.
In addition, since the spark plug 6 and the flame detection rod 7 and the fixture 10 are bonded and integrated with the adhesive 12 in advance, it is only necessary to attach the fixture 10 to the burner case 5 at the time of assembly. Can be reduced and the assembly is very simple. In addition, the spark plug 6 and the flame detection rod 7 are simply bonded by inserting the cylindrical insulators 8 and 9 formed integrally into the burring insertion holes 10a and 10b formed in the fixing bracket 10, respectively. Compared with the case where the spark plug 6 and the flame detection rod 7 are integrated with the support made of the insulator as in Document 2, the cost can be reduced.

As the means for integration, the adhesive material 12 is used in the first embodiment. However, instead of the adhesive 12, it may be integrated by press-fitting or caulking. In this case, the cost can be reduced as compared with the case where the adhesive 12 is used. Moreover, you may comprise the junction part of the insulators 8 and 9 of the spark plug 6 and the flame detection rod 7, and the burring insertion holes 10a and 10b in a taper shape. By aligning the joints between the spark plugs 6 and the insulators 8 and 9 of the flame detection rod 7 and the burring insertion holes 10a and 10b, it is possible to further improve the alignment and assemblability when they are integrated. Furthermore, the burring insertion holes 10a and 10b of the fixing bracket 10 may be formed in either the upper or lower direction.

Embodiment 2
Next, a second embodiment of the present invention will be described with reference to FIGS.
FIG. 5 is a perspective view showing a main part of a second embodiment of the present invention, and FIG.
In the second embodiment, one claw portion 10f is provided on each of the opposing side surfaces of the fixture 10 shown in the first embodiment. The claw portions 10f may be provided on the front and rear surfaces facing each other, or a plurality of claw portions 10f may be provided. On the other hand, a claw insertion hole 5d is provided at a position facing the claw portion 10f of the burner case 5.

According to the configuration of the second embodiment, the claw portion 10 f of the fixing metal fitting 10 is inserted into the claw insertion hole 5 d of the burner case 5, and the fixing metal fitting 10 is attached to the burner case 5 with the tightening screw 11. For this reason, the movement of the fixing bracket 10 is restricted by the engagement of the claw portion 10f and the claw insertion hole 5d. In addition to the effects of the first embodiment, the fixing bracket 10 is attached to the levers 8 and 9 during assembly, use or transportation. Even when an external force is applied, the fixed position does not move, and the displacement of the spark plug 6 and the tip of the flame detection rod 7 and the flame hole 3a of the burner head 3 can be prevented more reliably than in the first embodiment. it can.

Embodiment 3.
Next, Embodiment 3 of the present invention will be described with reference to the drawing of FIG.
In the third embodiment, the mounting holes 5a and 5b of the burner case 5 of the first embodiment are burring mounting holes in which burrings 5e and 5f are formed by press working.
Here, the outer peripheral dimensions A and B of the burrings 10d and 10e formed in the burring insertion holes 10a and 10b of the fixing bracket 10 are dimensional accuracy (about ± 0.05 to 0.1) because the fixing bracket 10 is formed by press working. It becomes better than the dimensional accuracy (about ± 0.5) of the conventional insulator cylinder. Further, the burrings 5e and 5f formed in the burring mounting holes 5a and 5b of the burner case 5 are also dimensional accuracy (± 0.05) similar to that of the fixing metal fitting 10 because the inner peripheral dimensions C and D are formed by pressing the burner case 5. About 0.1).

According to the third embodiment, by configuring as described above, in addition to the effects of the first embodiment described above, the burrings 5e and 5f of the burring mounting holes 5a and 5b of the burner case 5 and the fixing metal 5 Since the loose fitting with the burring insertion holes 10a and 10b can be reduced, the variation in the distance between the burner head 3 and the flame hole 3a after assembly can be reduced, and there is no need for readjustment during assembly. The number of man-hours for assembly can be further reduced as compared with 1.

It is a perspective view of the combustion apparatus which shows Embodiment 1 of this invention. It is a longitudinal cross-sectional view of the combustion apparatus which shows Embodiment 1 of this invention. It is a principal part perspective view of the combustion apparatus which shows Embodiment 1 of this invention. It is principal part sectional drawing of the combustion apparatus which shows Embodiment 1 of this invention. It is a principal part perspective view of the combustion apparatus which shows Embodiment 2 of this invention. It is principal part sectional drawing of the combustion apparatus which shows Embodiment 2 of this invention. It is principal part sectional drawing of the combustion apparatus which shows Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vaporizer 1a Seed heater 2 Mixing plate 3 Burner head 3a Flame hole 3b Wire net 4 Combustion ring 5 Burner case 5a, 5b Mounting hole (burring mounting hole)
5c Screw hole 5d Claw insertion hole 5e, 5f Burring 5g Flange 6 Spark plug 7 Flame detection rod 8, 9 Insulator 10 Fixing bracket 10a, 10b, Burring insertion hole 10c Insertion hole 10d, 10e Burring 10f Claw 11 Tightening screw 12 Adhesive

Claims (1)

A vaporizer for vaporizing fuel; a burner head for burning vaporized gas; a spark plug and a flame detection rod provided at a predetermined distance from a flame hole of the burner head; a burner case for housing the vaporizer; A combustion apparatus comprising: a fixing bracket that attaches the ignition plug and the flame detection rod to the burner case; and the ignition plug and the flame detection rod and the fixing bracket that are integrated in advance and attached to the burner case. The flame detection rod and the fixing bracket are integrated in advance by bonding, press-fitting, caulking, or the like by inserting the ignition plug and a lever portion of the flame detection rod into a burring insertion hole formed in the fixing bracket, respectively. A burring mounting hole is formed in the case, and the burring of the fixing bracket is inserted into the burring mounting hole. Combustion apparatus being characterized in that so as to loosely fitted.

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